Why did Anthropic hold back Mythos?

Mark Andreessen pointed out that one of the reasons why Anthropic might have wanted to hold back Mythos is they simply didn't have the compute to serve it. The model was huge and very expensive to serve, something like 10 or 20 times the token cost of say Opus. They knew Opus 4.7% was coming out, right.So, they hold it back knowing that they don't have the compute to serve it anyway, and they save their compute for the next iteration of Opus. And then, by holding it back, they create this impression of scar ...